Undetectable.ai vs ZeroGPT
ZeroGPT scores higher overall, 2.8 against 2.7 of 5.0, and leads in 4 of the six categories to 2. Which matters depends on the categories you weigh most.
Independently evaluated by huby · 2026-10-22 · scores free to read and cite
Overall scores
Category by category
A category is won on the higher score. Equal scores are counted for neither.
What the evaluation found
Undetectable.ai
Strongest category: Quality
Undetectable.ai demonstrates highly inconsistent performance, excelling at identifying simple, unedited AI or human writing but struggling significantly with more complex material. In controlled huby testing, the tool correctly identified all purely human-written documents but failed to flag two-thirds of AI-generated text that was edited or designed to be evasive. This performance gap extends to its rewriting feature, where the paid version can bypass some detectors while the free version is completely ineffective.
Undetectable.ai Research Brief, $35 →ZeroGPT
Strongest category: Use Cases & Pricing
ZeroGPT's market strategy is built on a generous free service that allows anyone to check large texts without registering, a key factor in attracting a broad base of individual users like students and writers. This widespread accessibility has helped it become one of the largest AI detectors by user count, with its popularity reflected in positive aggregate review scores. The free version is ad-supported and has usage limits, which encourages professionals to upgrade to paid plans for features like bulk file processing and developer access.
ZeroGPT Research Brief, $35 →Go deeper on either one
The scores above are free. A Research Brief adds every subcategory scored, the assessment behind each one, and who should consider it - six pages, in the shape a buying decision actually needs.
Common questions
Is Undetectable.ai or ZeroGPT better?
On huby's independent evaluation, ZeroGPT scores 2.8 against 2.7 for Undetectable.ai, and leads in 4 of the six categories. Neither is better at everything - the category table above shows where each one leads.
How are Undetectable.ai and ZeroGPT scored?
Both are evaluated against the same framework, on the same 1.0-5.0 scale, from evidence tiered by source. The scores were published 2026-10-22. huby takes no payment to change a score or a rank.
How many AI detectors has huby evaluated?
9 text detectors, all against the same framework, which is what makes these two comparable at all.
What do I get that is not on this page?
This page is free and always will be: both overall scores, all six category scores and a verdict. A Research Brief adds the subcategory scores, the written assessment behind each one, and who should consider the product.